Pneumatic Bow Actuator With Double Strings for Arrow Stability
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Solution Overview
Problem
Conventional bows face challenges in achieving high arrow velocity and precision, as well as reducing undesired arrow movement during and after launch, which affects accuracy.
Innovation Solution
A pneumatic actuator with a lubricating element and a double string system is introduced, where the actuator comprises a first and second portion defining a closed channel with a lubricating element that enhances air pressure and gas flow to increase arrow velocity and precision, and the double string configuration reduces sideward movement by maintaining equal tension across both strings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional bows are used, then the structure is simple, but the arrow velocity and precision are insufficient
Solution Approach 1:
The bow is divided into multiple functional components: a pneumatic actuator system with first and second portions defining a closed channel, a lubricating element with channels, and a double string system. Each component performs a specific function to collectively increase arrow velocity while managing system complexity.
Solution Approach 2:
A pneumatic actuator is introduced into the bow system, utilizing compressed air stored in a compartment defined by the first and second portions. The pneumatic pressure drives the second portion to move along the channel, generating force to launch the arrow at higher velocities.
2Reliability
If conventional single string is used, then the structure is simple, but undesired arrow movement during and after launch occurs
Solution Approach 1:
The single string is replaced with a double string system where two separate strings work in parallel. This segmentation allows each string to independently maintain tension and stabilize the arrow, reducing undesired movement during and after launch while improving reliability.
3Speed
If pneumatic actuator with lubricating element is added, then arrow velocity increases, but device complexity increases
Solution Approach 1:
The lubricating element is integrated within the pneumatic actuator structure, with the element positioned in the compartment and having channels that extend from the first surface to the second surface. This merging combines the lubrication function with the pneumatic actuation mechanism, reducing the need for separate lubrication systems and managing overall device complexity.
Solution Approach 2:
The lubricating element incorporates porous material structure with channels that allow controlled flow of lubricant and gas. The porous structure enables efficient gas flow and lubricant distribution within the actuator, enhancing performance while maintaining a compact design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The pneumatic actuator increases arrow velocity and precision by utilizing high air pressure and efficient gas flow, while the double string system minimizes arrow movement during launch, resulting in improved accuracy and stability.
Implementation Method 1
one or more channels extending from the first surface to the second surface
Implementation Method 2
a lubricant in or on the lubricating element
Implementation Method 3
a reduction in the volume of the compartment will increase an air pressure in the compartment acting to force the second portion outwardly of the channel again
Data Source
AI summary
A pneumatic actuator having therein a venting element and a porous element, compression and elongation of the actuator creating an air flow in the venting element and porous element to output lubricant as a mist toward a sliding interface of the actuator. A bow using the actuator and a bow having a double string preventing sideward movement when launching an arrow. A compound bow having limbs with multiple rotatable elements and an actuator rotating such elements to launch an arrow.